638773325 has 6 divisors (see below), whose sum is σ = 792078954. Its totient is φ = 511018640.

The previous prime is 638773301. The next prime is 638773327. The reversal of 638773325 is 523377836.

It can be written as a sum of positive squares in 3 ways, for example, as 124300201 + 514473124 = 11149^2 + 22682^2 .

It is not a de Polignac number, because 638773325 - 2¹⁰ = 638772301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638773327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12775442 + ... + 12775491.

It is an arithmetic number, because the mean of its divisors is an integer number (132013159).

Almost surely, 2^638773325 is an apocalyptic number.

It is an amenable number.

638773325 is a deficient number, since it is larger than the sum of its proper divisors (153305629).

638773325 is a wasteful number, since it uses less digits than its factorization.

638773325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25550943 (or 25550938 counting only the distinct ones).

The product of its digits is 635040, while the sum is 44.

The square root of 638773325 is about 25273.9653596344. The cubic root of 638773325 is about 861.2229423805. Note that the first 3 decimals are identical.

The spelling of 638773325 in words is "six hundred thirty-eight million, seven hundred seventy-three thousand, three hundred twenty-five".